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@@ -0,0 +1,134 @@
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+function (_cmake_cxx_import_std std variable)
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+ if (NOT CMAKE_CXX_STANDARD_LIBRARY STREQUAL "libstdc++")
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+ set("${variable}"
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+ "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Only `libstdc++` is supported\")\n"
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+ PARENT_SCOPE)
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+ return ()
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+ endif ()
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+
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+ execute_process(
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+ COMMAND
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+ "${CMAKE_CXX_COMPILER}"
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+ ${CMAKE_CXX_COMPILER_ID_ARG1}
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+ -print-file-name=libstdc++.modules.json
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+ OUTPUT_VARIABLE _gnu_libstdcxx_modules_json_file
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+ ERROR_VARIABLE _gnu_libstdcxx_modules_json_file_err
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+ RESULT_VARIABLE _gnu_libstdcxx_modules_json_file_res
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+ OUTPUT_STRIP_TRAILING_WHITESPACE
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+ ERROR_STRIP_TRAILING_WHITESPACE)
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+ if (_gnu_libstdcxx_modules_json_file_res)
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+ set("${variable}"
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+ "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Could not find `libstdc++.modules.json` resource\")\n"
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+ PARENT_SCOPE)
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+ return ()
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+ endif ()
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+
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+ # Without this file, we do not have modules installed.
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+ if (NOT EXISTS "${_gnu_libstdcxx_modules_json_file}")
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+ set("${variable}"
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+ "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`libstdc++.modules.json` resource does not exist\")\n"
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+ PARENT_SCOPE)
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+ return ()
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+ endif ()
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+
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+ file(READ "${_gnu_libstdcxx_modules_json_file}" _gnu_libstdcxx_modules_json)
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+ string(JSON _gnu_modules_json_version GET "${_gnu_libstdcxx_modules_json}" "version")
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+ string(JSON _gnu_modules_json_revision GET "${_gnu_libstdcxx_modules_json}" "revision")
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+ # Require version 1.
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+ if (NOT _gnu_modules_json_version EQUAL "1")
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+ set("${variable}"
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+ "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`libstdc++.modules.json` version ${_gnu_modules_json_version}.${_gnu_modules_json_revision} is not recognized\")\n"
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+ PARENT_SCOPE)
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+ return ()
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+ endif ()
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+
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+ string(JSON _gnu_modules_json_nmodules LENGTH "${_gnu_libstdcxx_modules_json}" "modules")
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+ # Don't declare the target without any modules.
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+ if (NOT _gnu_modules_json_nmodules)
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+ set("${variable}"
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+ "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`libstdc++.modules.json` does not list any available modules\")\n"
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+ PARENT_SCOPE)
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+ return ()
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+ endif ()
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+
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+ # Declare the target.
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+ set(_gnu_libstdcxx_target "")
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+ string(APPEND _gnu_libstdcxx_target
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+ "add_library(__CMAKE::CXX${std} IMPORTED INTERFACE)\n")
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+ string(APPEND _gnu_libstdcxx_target
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+ "target_compile_features(__CMAKE::CXX${std} INTERFACE cxx_std_${std})\n")
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+
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+ set(_gnu_modules_is_stdlib 0)
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+ set(_gnu_modules_include_dirs_list "")
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+ set(_gnu_modules_module_paths "")
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+ get_filename_component(_gnu_modules_dir "${_gnu_libstdcxx_modules_json_file}" DIRECTORY)
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+
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+ # Add module sources.
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+ math(EXPR _gnu_modules_json_nmodules_range "${_gnu_modules_json_nmodules} - 1")
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+ foreach (_gnu_modules_json_modules_idx RANGE 0 "${_gnu_modules_json_nmodules_range}")
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+ string(JSON _gnu_modules_json_module GET "${_gnu_libstdcxx_modules_json}" "modules" "${_gnu_modules_json_modules_idx}")
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+
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+ string(JSON _gnu_modules_json_module_source GET "${_gnu_modules_json_module}" "source-path")
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+ string(JSON _gnu_modules_json_module_is_stdlib GET "${_gnu_modules_json_module}" "is-std-library")
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+ string(JSON _gnu_modules_json_module_local_arguments ERROR_VARIABLE _gnu_modules_json_module_local_arguments_error GET "${_gnu_modules_json_module}" "local-arguments")
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+ string(JSON _gnu_modules_json_module_nsystem_include_directories ERROR_VARIABLE _gnu_modules_json_module_nsystem_include_directories_error LENGTH "${_gnu_modules_json_module_local_arguments}" "system-include-directories")
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+
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+ if (_gnu_modules_json_module_local_arguments_error STREQUAL "NOTFOUND")
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+ set(_gnu_modules_json_module_local_arguments "")
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+ endif ()
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+ if (_gnu_modules_json_module_nsystem_include_directories_error STREQUAL "NOTFOUND")
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+ set(_gnu_modules_json_module_nsystem_include_directories 0)
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+ endif ()
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+
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+ if (NOT IS_ABSOLUTE "${_gnu_modules_json_module_source}")
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+ string(PREPEND _gnu_modules_json_module_source "${_gnu_modules_dir}/")
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+ endif ()
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+ list(APPEND _gnu_modules_module_paths
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+ "${_gnu_modules_json_module_source}")
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+
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+ if (_gnu_modules_json_module_is_stdlib)
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+ set(_gnu_modules_is_stdlib 1)
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+ endif ()
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+
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+ if (_gnu_modules_json_module_nsystem_include_directories)
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+ math(EXPR _gnu_modules_json_module_nsystem_include_directories_range "${_gnu_modules_json_module_nsystem_include_directories} - 1")
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+ foreach (_gnu_modules_json_modules_system_include_directories_idx RANGE 0 "${_gnu_modules_json_module_nsystem_include_directories_range}")
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+ string(JSON _gnu_modules_json_module_system_include_directory GET "${_gnu_modules_json_module_local_arguments}" "system-include-directories" "${_gnu_modules_json_modules_system_include_directories_idx}")
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+
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+ if (NOT IS_ABSOLUTE "${_gnu_modules_json_module_system_include_directory}")
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+ string(PREPEND _gnu_modules_json_module_system_include_directory "${_gnu_modules_dir}/")
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+ endif ()
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+ list(APPEND _gnu_modules_include_dirs_list
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+ "${_gnu_modules_json_module_system_include_directory}")
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+ endforeach ()
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+ endif ()
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+ endforeach ()
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+
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+ # Split the paths into basedirs and module paths.
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+ set(_gnu_modules_base_dirs_list "")
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+ set(_gnu_modules_files "")
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+ foreach (_gnu_modules_module_path IN LISTS _gnu_modules_module_paths)
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+ get_filename_component(_gnu_module_dir "${_gnu_modules_module_path}" DIRECTORY)
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+
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+ list(APPEND _gnu_modules_base_dirs_list
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+ "${_gnu_module_dir}")
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+ string(APPEND _gnu_modules_files
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+ " \"${_gnu_modules_module_path}\"")
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+ endforeach ()
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+ list(REMOVE_DUPLICATES _gnu_modules_base_dirs_list)
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+ set(_gnu_modules_base_dirs "")
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+ foreach (_gnu_modules_base_dir IN LISTS _gnu_modules_base_dirs_list)
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+ string(APPEND _gnu_modules_base_dirs
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+ " \"${_gnu_modules_base_dir}\"")
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+ endforeach ()
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+
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+ # Create the file set for the modules.
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+ string(APPEND _gnu_libstdcxx_target
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+ "target_sources(__CMAKE::CXX${std}
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+ INTERFACE
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+ FILE_SET std TYPE CXX_MODULES
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+ BASE_DIRS ${_gnu_modules_base_dirs}
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+ FILES ${_gnu_modules_files})\n")
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+
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+ set("${variable}" "${_gnu_libstdcxx_target}" PARENT_SCOPE)
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+endfunction ()
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Brad King